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This is a short overview. For the background — history, value over time and notable mines — see Rhyolite →
A pale, fine-grained volcanic rock with the composition of granite, formed where silica-rich lava cooled quickly at the surface. In the north of Ireland it occurs chiefly around Tardree in County Antrim, where it was quarried for building stone and paving.
| Mine | Region | Worked |
|---|---|---|
| Preseli Bluestone Quarries | Pembrokeshire | Around 3000 BC–c. 3000 BC (no later working) |
| Tardree Quarry | County Antrim | By 1902 (working)–by 1997 |
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